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posixunix.scm
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;;;; posixunix.scm - Miscellaneous file- and process-handling routines
;
; Copyright (c) 2008-2015, The CHICKEN Team
; Copyright (c) 2000-2007, Felix L. Winkelmann
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
; conditions are met:
;
; Redistributions of source code must retain the above copyright notice, this list of conditions and the following
; disclaimer.
; Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
; disclaimer in the documentation and/or other materials provided with the distribution.
; Neither the name of the author nor the names of its contributors may be used to endorse or promote
; products derived from this software without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
; AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
; POSSIBILITY OF SUCH DAMAGE.
(declare
(unit posix)
(uses scheduler irregex extras files ports)
(disable-interrupts)
(hide group-member _get-groups _ensure-groups posix-error ##sys#terminal-check)
(not inline ##sys#interrupt-hook ##sys#user-interrupt-hook))
;; these are not available on Windows
(define-foreign-variable _stat_st_blksize unsigned-int "C_statbuf.st_blksize")
(define-foreign-variable _stat_st_blocks unsigned-int "C_statbuf.st_blocks")
;;; common code
(include "posix-common.scm")
(declare
(foreign-declare #<<EOF
static C_TLS int C_wait_status;
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/utsname.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <dirent.h>
#include <pwd.h>
#include <utime.h>
#if defined(__sun) && defined(__SVR4)
# include <sys/tty.h>
# include <termios.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#include <sys/mman.h>
#include <sys/poll.h>
#ifndef O_FSYNC
# define O_FSYNC O_SYNC
#endif
#ifndef PIPE_BUF
# ifdef __CYGWIN__
# define PIPE_BUF _POSIX_PIPE_BUF
# else
# define PIPE_BUF 1024
# endif
#endif
#ifndef O_BINARY
# define O_BINARY 0
#endif
#ifndef O_TEXT
# define O_TEXT 0
#endif
#ifndef ARG_MAX
# define ARG_MAX 256
#endif
#ifndef MAP_FILE
# define MAP_FILE 0
#endif
#ifndef MAP_ANON
# define MAP_ANON 0
#endif
#if defined(HAVE_CRT_EXTERNS_H)
# include <crt_externs.h>
# define C_getenventry(i) ((*_NSGetEnviron())[ i ])
#elif defined(C_MACOSX)
# define C_getenventry(i) NULL
#else
extern char **environ;
# define C_getenventry(i) (environ[ i ])
#endif
#ifndef ENV_MAX
# define ENV_MAX 1024
#endif
#ifndef FILENAME_MAX
# define FILENAME_MAX 1024
#endif
static C_TLS char *C_exec_args[ ARG_MAX ];
static C_TLS char *C_exec_env[ ENV_MAX ];
static C_TLS struct utsname C_utsname;
static C_TLS struct flock C_flock;
static C_TLS DIR *temphandle;
static C_TLS struct passwd *C_user;
#ifdef HAVE_GRP_H
static C_TLS struct group *C_group;
#else
static C_TLS struct {
char *gr_name, gr_passwd;
int gr_gid;
char *gr_mem[ 1 ];
} C_group = { "", "", 0, { "" } };
#endif
/* Android doesn't provide pw_gecos in the passwd struct */
#ifdef __ANDROID__
# define C_PW_GECOS ("")
#else
# define C_PW_GECOS (C_user->pw_gecos)
#endif
static C_TLS int C_pipefds[ 2 ];
static C_TLS time_t C_secs;
static C_TLS struct timeval C_timeval;
static C_TLS char C_hostbuf[ 256 ];
static C_TLS struct stat C_statbuf;
#define C_mkdir(str) C_fix(mkdir(C_c_string(str), S_IRWXU | S_IRWXG | S_IRWXO))
#define C_fchdir(fd) C_fix(fchdir(C_unfix(fd)))
#define C_chdir(str) C_fix(chdir(C_c_string(str)))
#define C_rmdir(str) C_fix(rmdir(C_c_string(str)))
#define open_binary_input_pipe(a, n, name) C_mpointer(a, popen(C_c_string(name), "r"))
#define open_text_input_pipe(a, n, name) open_binary_input_pipe(a, n, name)
#define open_binary_output_pipe(a, n, name) C_mpointer(a, popen(C_c_string(name), "w"))
#define open_text_output_pipe(a, n, name) open_binary_output_pipe(a, n, name)
#define close_pipe(p) C_fix(pclose(C_port_file(p)))
#define C_fork fork
#define C_waitpid(id, o) C_fix(waitpid(C_unfix(id), &C_wait_status, C_unfix(o)))
#define C_getppid getppid
#define C_kill(id, s) C_fix(kill(C_unfix(id), C_unfix(s)))
#define C_getuid getuid
#define C_getgid getgid
#define C_geteuid geteuid
#define C_getegid getegid
#define C_chown(fn, u, g) C_fix(chown(C_data_pointer(fn), C_unfix(u), C_unfix(g)))
#define C_chmod(fn, m) C_fix(chmod(C_data_pointer(fn), C_unfix(m)))
#define C_setuid(id) C_fix(setuid(C_unfix(id)))
#define C_setgid(id) C_fix(setgid(C_unfix(id)))
#define C_seteuid(id) C_fix(seteuid(C_unfix(id)))
#define C_setegid(id) C_fix(setegid(C_unfix(id)))
#define C_setsid(dummy) C_fix(setsid())
#define C_setpgid(x, y) C_fix(setpgid(C_unfix(x), C_unfix(y)))
#define C_getpgid(x) C_fix(getpgid(C_unfix(x)))
#define C_symlink(o, n) C_fix(symlink(C_data_pointer(o), C_data_pointer(n)))
#define C_do_readlink(f, b) C_fix(readlink(C_data_pointer(f), C_data_pointer(b), FILENAME_MAX))
#define C_getpwnam(n) C_mk_bool((C_user = getpwnam((char *)C_data_pointer(n))) != NULL)
#define C_getpwuid(u) C_mk_bool((C_user = getpwuid(C_unfix(u))) != NULL)
#if !defined(__ANDROID__) && defined(HAVE_GRP_H)
#define C_getgrnam(n) C_mk_bool((C_group = getgrnam((char *)C_data_pointer(n))) != NULL)
#define C_getgrgid(u) C_mk_bool((C_group = getgrgid(C_unfix(u))) != NULL)
#else
#define C_getgrnam(n) C_SCHEME_FALSE
#define C_getgrgid(n) C_SCHEME_FALSE
#endif
#define C_pipe(d) C_fix(pipe(C_pipefds))
#define C_truncate(f, n) C_fix(truncate((char *)C_data_pointer(f), C_num_to_int(n)))
#define C_ftruncate(f, n) C_fix(ftruncate(C_unfix(f), C_num_to_int(n)))
#define C_uname C_fix(uname(&C_utsname))
#define C_alarm alarm
#define C_setvbuf(p, m, s) C_fix(setvbuf(C_port_file(p), NULL, C_unfix(m), C_unfix(s)))
#define C_test_access(fn, m) C_fix(access((char *)C_data_pointer(fn), C_unfix(m)))
#define C_close(fd) C_fix(close(C_unfix(fd)))
#define C_sleep sleep
#define C_umask(m) C_fix(umask(C_unfix(m)))
#define C_lstat(fn) C_fix(lstat((char *)C_data_pointer(fn), &C_statbuf))
static void C_fcall C_set_arg_string(char **where, int i, char *a, int len) {
char *ptr;
if(a != NULL) {
ptr = (char *)C_malloc(len + 1);
C_memcpy(ptr, a, len);
ptr[ len ] = '\0';
/* Can't barf() here, so the NUL byte check happens in Scheme */
}
else ptr = NULL;
where[ i ] = ptr;
}
static void C_fcall C_free_arg_string(char **where) {
while((*where) != NULL) C_free(*(where++));
}
#define C_set_exec_arg(i, a, len) C_set_arg_string(C_exec_args, i, a, len)
#define C_free_exec_args() C_free_arg_string(C_exec_args)
#define C_set_exec_env(i, a, len) C_set_arg_string(C_exec_env, i, a, len)
#define C_free_exec_env() C_free_arg_string(C_exec_env)
#define C_execvp(f) C_fix(execvp(C_data_pointer(f), C_exec_args))
#define C_execve(f) C_fix(execve(C_data_pointer(f), C_exec_args, C_exec_env))
#if defined(__FreeBSD__) || defined(C_MACOSX) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__sgi__) || defined(sgi) || defined(__DragonFly__) || defined(__SUNPRO_C)
static C_TLS int C_uw;
# define C_WIFEXITED(n) (C_uw = C_unfix(n), C_mk_bool(WIFEXITED(C_uw)))
# define C_WIFSIGNALED(n) (C_uw = C_unfix(n), C_mk_bool(WIFSIGNALED(C_uw)))
# define C_WIFSTOPPED(n) (C_uw = C_unfix(n), C_mk_bool(WIFSTOPPED(C_uw)))
# define C_WEXITSTATUS(n) (C_uw = C_unfix(n), C_fix(WEXITSTATUS(C_uw)))
# define C_WTERMSIG(n) (C_uw = C_unfix(n), C_fix(WTERMSIG(C_uw)))
# define C_WSTOPSIG(n) (C_uw = C_unfix(n), C_fix(WSTOPSIG(C_uw)))
#else
# define C_WIFEXITED(n) C_mk_bool(WIFEXITED(C_unfix(n)))
# define C_WIFSIGNALED(n) C_mk_bool(WIFSIGNALED(C_unfix(n)))
# define C_WIFSTOPPED(n) C_mk_bool(WIFSTOPPED(C_unfix(n)))
# define C_WEXITSTATUS(n) C_fix(WEXITSTATUS(C_unfix(n)))
# define C_WTERMSIG(n) C_fix(WTERMSIG(C_unfix(n)))
# define C_WSTOPSIG(n) C_fix(WSTOPSIG(C_unfix(n)))
#endif
#ifdef __CYGWIN__
# define C_mkfifo(fn, m) C_fix(-1);
#else
# define C_mkfifo(fn, m) C_fix(mkfifo((char *)C_data_pointer(fn), C_unfix(m)))
#endif
#define C_flock_setup(t, s, n) (C_flock.l_type = C_unfix(t), C_flock.l_start = C_num_to_int(s), C_flock.l_whence = SEEK_SET, C_flock.l_len = C_num_to_int(n), C_SCHEME_UNDEFINED)
#define C_flock_test(p) (fcntl(fileno(C_port_file(p)), F_GETLK, &C_flock) >= 0 ? (C_flock.l_type == F_UNLCK ? C_fix(0) : C_fix(C_flock.l_pid)) : C_SCHEME_FALSE)
#define C_flock_lock(p) C_fix(fcntl(fileno(C_port_file(p)), F_SETLK, &C_flock))
#define C_flock_lockw(p) C_fix(fcntl(fileno(C_port_file(p)), F_SETLKW, &C_flock))
static C_TLS sigset_t C_sigset;
#define C_sigemptyset(d) (sigemptyset(&C_sigset), C_SCHEME_UNDEFINED)
#define C_sigaddset(s) (sigaddset(&C_sigset, C_unfix(s)), C_SCHEME_UNDEFINED)
#define C_sigdelset(s) (sigdelset(&C_sigset, C_unfix(s)), C_SCHEME_UNDEFINED)
#define C_sigismember(s) C_mk_bool(sigismember(&C_sigset, C_unfix(s)))
#define C_sigprocmask_set(d) C_fix(sigprocmask(SIG_SETMASK, &C_sigset, NULL))
#define C_sigprocmask_block(d) C_fix(sigprocmask(SIG_BLOCK, &C_sigset, NULL))
#define C_sigprocmask_unblock(d) C_fix(sigprocmask(SIG_UNBLOCK, &C_sigset, NULL))
#define C_sigprocmask_get(d) C_fix(sigprocmask(SIG_SETMASK, NULL, &C_sigset))
#define C_open(fn, fl, m) C_fix(open(C_c_string(fn), C_unfix(fl), C_unfix(m)))
#define C_read(fd, b, n) C_fix(read(C_unfix(fd), C_data_pointer(b), C_unfix(n)))
#define C_write(fd, b, n) C_fix(write(C_unfix(fd), C_data_pointer(b), C_unfix(n)))
#define C_mkstemp(t) C_fix(mkstemp(C_c_string(t)))
#define C_ctime(n) (C_secs = (n), ctime(&C_secs))
#if defined(__SVR4) || defined(C_MACOSX) || defined(__ANDROID__) || defined(_AIX)
/* Seen here: http://lists.samba.org/archive/samba-technical/2002-November/025571.html */
static time_t C_timegm(struct tm *t)
{
time_t tl, tb;
struct tm *tg;
tl = mktime (t);
if (tl == -1)
{
t->tm_hour--;
tl = mktime (t);
if (tl == -1)
return -1; /* can't deal with output from strptime */
tl += 3600;
}
tg = gmtime (&tl);
tg->tm_isdst = 0;
tb = mktime (tg);
if (tb == -1)
{
tg->tm_hour--;
tb = mktime (tg);
if (tb == -1)
return -1; /* can't deal with output from gmtime */
tb += 3600;
}
return (tl - (tb - tl));
}
#else
#define C_timegm timegm
#endif
#define C_a_timegm(ptr, c, v, tm) C_flonum(ptr, C_timegm(C_tm_set((v), C_data_pointer(tm))))
#ifdef __linux__
extern char *strptime(const char *s, const char *format, struct tm *tm);
extern pid_t getpgid(pid_t pid);
#endif
/* tm_get could be in posix-common, but it's only used in here */
#define cpy_tmstc08_to_tmvec(v, ptm) \
(C_set_block_item((v), 0, C_fix(((struct tm *)ptm)->tm_sec)), \
C_set_block_item((v), 1, C_fix((ptm)->tm_min)), \
C_set_block_item((v), 2, C_fix((ptm)->tm_hour)), \
C_set_block_item((v), 3, C_fix((ptm)->tm_mday)), \
C_set_block_item((v), 4, C_fix((ptm)->tm_mon)), \
C_set_block_item((v), 5, C_fix((ptm)->tm_year)), \
C_set_block_item((v), 6, C_fix((ptm)->tm_wday)), \
C_set_block_item((v), 7, C_fix((ptm)->tm_yday)), \
C_set_block_item((v), 8, ((ptm)->tm_isdst ? C_SCHEME_TRUE : C_SCHEME_FALSE)))
#define cpy_tmstc9_to_tmvec(v, ptm) \
(C_set_block_item((v), 9, C_fix(-(ptm)->tm_gmtoff)))
#define C_tm_get_08(v, tm) cpy_tmstc08_to_tmvec( (v), (tm) )
#define C_tm_get_9(v, tm) cpy_tmstc9_to_tmvec( (v), (tm) )
static C_word
C_tm_get( C_word v, void *tm )
{
C_tm_get_08( v, (struct tm *)tm );
#if defined(C_GNU_ENV) && !defined(__CYGWIN__) && !defined(__uClinux__)
C_tm_get_9( v, (struct tm *)tm );
#endif
return v;
}
#define C_strptime(s, f, v, stm) \
(strptime(C_c_string(s), C_c_string(f), ((struct tm *)(stm))) ? C_tm_get((v), (stm)) : C_SCHEME_FALSE)
static gid_t *C_groups = NULL;
#define C_get_gid(n) C_fix(C_groups[ C_unfix(n) ])
#define C_set_gid(n, id) (C_groups[ C_unfix(n) ] = C_unfix(id), C_SCHEME_UNDEFINED)
#define C_set_groups(n) C_fix(setgroups(C_unfix(n), C_groups))
#if !defined(__ANDROID__) && defined(TIOCGWINSZ)
static int get_tty_size(int p, int *rows, int *cols)
{
struct winsize tty_size;
int r;
memset(&tty_size, 0, sizeof tty_size);
r = ioctl(p, TIOCGWINSZ, &tty_size);
if (r == 0) {
*rows = tty_size.ws_row;
*cols = tty_size.ws_col;
}
return r;
}
#else
static int get_tty_size(int p, int *rows, int *cols)
{
*rows = *cols = 0;
return -1;
}
#endif
static int set_file_mtime(char *filename, C_word tm)
{
struct utimbuf tb;
tb.actime = tb.modtime = C_num_to_int(tm);
return utime(filename, &tb);
}
static C_word C_i_fifo_p(C_word name)
{
struct stat buf;
int res;
res = stat(C_c_string(name), &buf);
if(res != 0) {
#ifdef __CYGWIN__
return C_SCHEME_FALSE;
#else
if(errno == ENOENT) return C_fix(0);
else return C_fix(res);
#endif
}
if((buf.st_mode & S_IFMT) == S_IFIFO) return C_SCHEME_TRUE;
else return C_SCHEME_FALSE;
}
EOF
) )
;; Faster versions of common operations
(define ##sys#file-nonblocking!
(foreign-lambda* bool ([int fd])
"int val = fcntl(fd, F_GETFL, 0);"
"if(val == -1) C_return(0);"
"C_return(fcntl(fd, F_SETFL, val | O_NONBLOCK) != -1);" ) )
(define ##sys#file-select-one (foreign-lambda int "C_check_fd_ready" int) )
;;; Lo-level I/O:
(define-foreign-variable _pipe_buf int "PIPE_BUF")
(define pipe/buf _pipe_buf)
(define-foreign-variable _f_dupfd int "F_DUPFD")
(define-foreign-variable _f_getfd int "F_GETFD")
(define-foreign-variable _f_setfd int "F_SETFD")
(define-foreign-variable _f_getfl int "F_GETFL")
(define-foreign-variable _f_setfl int "F_SETFL")
(define fcntl/dupfd _f_dupfd)
(define fcntl/getfd _f_getfd)
(define fcntl/setfd _f_setfd)
(define fcntl/getfl _f_getfl)
(define fcntl/setfl _f_setfl)
(define-foreign-variable _o_rdonly int "O_RDONLY")
(define-foreign-variable _o_wronly int "O_WRONLY")
(define-foreign-variable _o_rdwr int "O_RDWR")
(define-foreign-variable _o_creat int "O_CREAT")
(define-foreign-variable _o_append int "O_APPEND")
(define-foreign-variable _o_excl int "O_EXCL")
(define-foreign-variable _o_noctty int "O_NOCTTY")
(define-foreign-variable _o_nonblock int "O_NONBLOCK")
(define-foreign-variable _o_trunc int "O_TRUNC")
(define-foreign-variable _o_fsync int "O_FSYNC")
(define-foreign-variable _o_binary int "O_BINARY")
(define-foreign-variable _o_text int "O_TEXT")
(define open/rdonly _o_rdonly)
(define open/wronly _o_wronly)
(define open/rdwr _o_rdwr)
(define open/read _o_rdonly)
(define open/write _o_wronly)
(define open/creat _o_creat)
(define open/append _o_append)
(define open/excl _o_excl)
(define open/noctty _o_noctty)
(define open/nonblock _o_nonblock)
(define open/trunc _o_trunc)
(define open/sync _o_fsync)
(define open/fsync _o_fsync)
(define open/binary _o_binary)
(define open/text _o_text)
(define-foreign-variable _s_irusr int "S_IRUSR")
(define-foreign-variable _s_iwusr int "S_IWUSR")
(define-foreign-variable _s_ixusr int "S_IXUSR")
(define-foreign-variable _s_irgrp int "S_IRGRP")
(define-foreign-variable _s_iwgrp int "S_IWGRP")
(define-foreign-variable _s_ixgrp int "S_IXGRP")
(define-foreign-variable _s_iroth int "S_IROTH")
(define-foreign-variable _s_iwoth int "S_IWOTH")
(define-foreign-variable _s_ixoth int "S_IXOTH")
(define-foreign-variable _s_irwxu int "S_IRWXU")
(define-foreign-variable _s_irwxg int "S_IRWXG")
(define-foreign-variable _s_irwxo int "S_IRWXO")
(define-foreign-variable _s_isuid int "S_ISUID")
(define-foreign-variable _s_isgid int "S_ISGID")
(define-foreign-variable _s_isvtx int "S_ISVTX")
(define perm/irusr _s_irusr)
(define perm/iwusr _s_iwusr)
(define perm/ixusr _s_ixusr)
(define perm/irgrp _s_irgrp)
(define perm/iwgrp _s_iwgrp)
(define perm/ixgrp _s_ixgrp)
(define perm/iroth _s_iroth)
(define perm/iwoth _s_iwoth)
(define perm/ixoth _s_ixoth)
(define perm/irwxu _s_irwxu)
(define perm/irwxg _s_irwxg)
(define perm/irwxo _s_irwxo)
(define perm/isvtx _s_isvtx)
(define perm/isuid _s_isuid)
(define perm/isgid _s_isgid)
(define file-control
(let ([fcntl (foreign-lambda int fcntl int int long)])
(lambda (fd cmd #!optional (arg 0))
(##sys#check-exact fd 'file-control)
(##sys#check-exact cmd 'file-control)
(let ([res (fcntl fd cmd arg)])
(if (fx= res -1)
(posix-error #:file-error 'file-control "cannot control file" fd cmd)
res ) ) ) ) )
(define file-open
(let ([defmode (bitwise-ior _s_irwxu (bitwise-ior _s_irgrp _s_iroth))] )
(lambda (filename flags . mode)
(let ([mode (if (pair? mode) (car mode) defmode)])
(##sys#check-string filename 'file-open)
(##sys#check-exact flags 'file-open)
(##sys#check-exact mode 'file-open)
(let ([fd (##core#inline "C_open" (##sys#make-c-string filename 'file-open) flags mode)])
(when (eq? -1 fd)
(posix-error #:file-error 'file-open "cannot open file" filename flags mode) )
fd) ) ) ) )
(define file-close
(lambda (fd)
(##sys#check-exact fd 'file-close)
(when (fx< (##core#inline "C_close" fd) 0)
(posix-error #:file-error 'file-close "cannot close file" fd) ) ) )
(define file-read
(lambda (fd size . buffer)
(##sys#check-exact fd 'file-read)
(##sys#check-exact size 'file-read)
(let ([buf (if (pair? buffer) (car buffer) (make-string size))])
(unless (and (##core#inline "C_blockp" buf) (##core#inline "C_byteblockp" buf))
(##sys#signal-hook #:type-error 'file-read "bad argument type - not a string or blob" buf) )
(let ([n (##core#inline "C_read" fd buf size)])
(when (eq? -1 n)
(posix-error #:file-error 'file-read "cannot read from file" fd size) )
(list buf n) ) ) ) )
(define file-write
(lambda (fd buffer . size)
(##sys#check-exact fd 'file-write)
(unless (and (##core#inline "C_blockp" buffer) (##core#inline "C_byteblockp" buffer))
(##sys#signal-hook #:type-error 'file-write "bad argument type - not a string or blob" buffer) )
(let ([size (if (pair? size) (car size) (##sys#size buffer))])
(##sys#check-exact size 'file-write)
(let ([n (##core#inline "C_write" fd buffer size)])
(when (eq? -1 n)
(posix-error #:file-error 'file-write "cannot write to file" fd size) )
n) ) ) )
(define file-mkstemp
(lambda (template)
(##sys#check-string template 'file-mkstemp)
(let* ([buf (##sys#make-c-string template 'file-mkstemp)]
[fd (##core#inline "C_mkstemp" buf)]
[path-length (##sys#size buf)])
(when (eq? -1 fd)
(posix-error #:file-error 'file-mkstemp "cannot create temporary file" template) )
(values fd (##sys#substring buf 0 (fx- path-length 1) ) ) ) ) )
;;; I/O multiplexing:
(define (file-select fdsr fdsw . timeout)
(let* ((tm (if (pair? timeout) (car timeout) #f))
(fdsrl (cond ((not fdsr) '())
((fixnum? fdsr) (list fdsr))
(else (##sys#check-list fdsr 'file-select)
fdsr)))
(fdswl (cond ((not fdsw) '())
((fixnum? fdsw) (list fdsw))
(else (##sys#check-list fdsw 'file-select)
fdsw)))
(nfdsr (##sys#length fdsrl))
(nfdsw (##sys#length fdswl))
(nfds (fx+ nfdsr nfdsw))
(fds-blob (##sys#make-blob
(fx* nfds (foreign-value "sizeof(struct pollfd)" int)))))
(when tm (##sys#check-number tm))
(do ((i 0 (fx+ i 1))
(fdsrl fdsrl (cdr fdsrl)))
((null? fdsrl))
((foreign-lambda* void ((int i) (int fd) (scheme-pointer p))
"struct pollfd *fds = p;"
"fds[i].fd = fd; fds[i].events = POLLIN;") i (car fdsrl) fds-blob))
(do ((i nfdsr (fx+ i 1))
(fdswl fdswl (cdr fdswl)))
((null? fdswl))
((foreign-lambda* void ((int i) (int fd) (scheme-pointer p))
"struct pollfd *fds = p;"
"fds[i].fd = fd; fds[i].events = POLLOUT;") i (car fdswl) fds-blob))
(let ((n ((foreign-lambda int "poll" scheme-pointer int int)
fds-blob nfds (if tm (inexact->exact (* (max 0 tm) 1000)) -1))))
(cond ((fx< n 0)
(posix-error #:file-error 'file-select "failed" fdsr fdsw) )
((fx= n 0) (values (if (pair? fdsr) '() #f) (if (pair? fdsw) '() #f)))
(else
(let ((rl (let lp ((i 0) (res '()) (fds fdsrl))
(cond ((null? fds) (##sys#fast-reverse res))
(((foreign-lambda* bool ((int i) (scheme-pointer p))
"struct pollfd *fds = p;"
"C_return(fds[i].revents & (POLLIN|POLLERR|POLLHUP|POLLNVAL));")
i fds-blob)
(lp (fx+ i 1) (cons (car fds) res) (cdr fds)))
(else (lp (fx+ i 1) res (cdr fds))))))
(wl (let lp ((i nfdsr) (res '()) (fds fdswl))
(cond ((null? fds) (##sys#fast-reverse res))
(((foreign-lambda* bool ((int i) (scheme-pointer p))
"struct pollfd *fds = p;"
"C_return(fds[i].revents & (POLLOUT|POLLERR|POLLHUP|POLLNVAL));")
i fds-blob)
(lp (fx+ i 1) (cons (car fds) res) (cdr fds)))
(else (lp (fx+ i 1) res (cdr fds)))))))
(values
(and fdsr (if (fixnum? fdsr) (and (memq fdsr rl) fdsr) rl))
(and fdsw (if (fixnum? fdsw) (and (memq fdsw wl) fdsw) wl)))))))))
;;; Directory stuff:
(define-inline (*create-directory loc name)
(unless (fx= 0 (##core#inline "C_mkdir" (##sys#make-c-string name loc)))
(posix-error #:file-error loc "cannot create directory" name)) )
(define create-directory
(lambda (name #!optional parents?)
(##sys#check-string name 'create-directory)
(unless (or (fx= 0 (##sys#size name))
(file-exists? name))
(if parents?
(let loop ((dir (let-values (((dir file ext) (decompose-pathname name)))
(if file (make-pathname dir file ext) dir))))
(when (and dir (not (directory? dir)))
(loop (pathname-directory dir))
(*create-directory 'create-directory dir)) )
(*create-directory 'create-directory name) ) )
name))
(define change-directory
(lambda (name)
(##sys#check-string name 'change-directory)
(let ((sname (##sys#make-c-string name 'change-directory)))
(unless (fx= 0 (##core#inline "C_chdir" sname))
(posix-error #:file-error 'change-directory "cannot change current directory" name) )
name)))
(define (change-directory* fd)
(##sys#check-exact fd 'change-directory*)
(unless (fx= 0 (##core#inline "C_fchdir" fd))
(posix-error #:file-error 'change-directory* "cannot change current directory" fd) )
fd)
;;; Pipes:
(let ()
(define (mode arg) (if (pair? arg) (##sys#slot arg 0) '###text))
(define (badmode m) (##sys#error "illegal input/output mode specifier" m))
(define (check loc cmd inp r)
(if (##sys#null-pointer? r)
(posix-error #:file-error loc "cannot open pipe" cmd)
(let ([port (##sys#make-port inp ##sys#stream-port-class "(pipe)" 'stream)])
(##core#inline "C_set_file_ptr" port r)
port) ) )
(set! open-input-pipe
(lambda (cmd . m)
(##sys#check-string cmd 'open-input-pipe)
(let ([m (mode m)])
(check
'open-input-pipe
cmd #t
(case m
((#:text) (##core#inline_allocate ("open_text_input_pipe" 2) (##sys#make-c-string cmd 'open-input-pipe)))
((#:binary) (##core#inline_allocate ("open_binary_input_pipe" 2) (##sys#make-c-string cmd 'open-input-pipe)))
(else (badmode m)) ) ) ) ) )
(set! open-output-pipe
(lambda (cmd . m)
(##sys#check-string cmd 'open-output-pipe)
(let ((m (mode m)))
(check
'open-output-pipe
cmd #f
(case m
((#:text) (##core#inline_allocate ("open_text_output_pipe" 2) (##sys#make-c-string cmd 'open-output-pipe)))
((#:binary) (##core#inline_allocate ("open_binary_output_pipe" 2) (##sys#make-c-string cmd 'open-output-pipe)))
(else (badmode m)) ) ) ) ) )
(set! close-input-pipe
(lambda (port)
(##sys#check-input-port port #t 'close-input-pipe)
(let ((r (##core#inline "close_pipe" port)))
(when (eq? -1 r)
(posix-error #:file-error 'close-input-pipe "error while closing pipe" port))
r) ) )
(set! close-output-pipe
(lambda (port)
(##sys#check-output-port port #t 'close-output-pipe)
(let ((r (##core#inline "close_pipe" port)))
(when (eq? -1 r)
(posix-error #:file-error 'close-output-pipe "error while closing pipe" port))
r) ) ))
(define call-with-input-pipe
(lambda (cmd proc . mode)
(let ([p (apply open-input-pipe cmd mode)])
(##sys#call-with-values
(lambda () (proc p))
(lambda results
(close-input-pipe p)
(apply values results) ) ) ) ) )
(define call-with-output-pipe
(lambda (cmd proc . mode)
(let ([p (apply open-output-pipe cmd mode)])
(##sys#call-with-values
(lambda () (proc p))
(lambda results
(close-output-pipe p)
(apply values results) ) ) ) ) )
(define with-input-from-pipe
(lambda (cmd thunk . mode)
(let ([p (apply open-input-pipe cmd mode)])
(fluid-let ((##sys#standard-input p))
(##sys#call-with-values thunk
(lambda results
(close-input-pipe p)
(apply values results) ) ) ) ) ) )
(define with-output-to-pipe
(lambda (cmd thunk . mode)
(let ([p (apply open-output-pipe cmd mode)])
(fluid-let ((##sys#standard-output p))
(##sys#call-with-values thunk
(lambda results
(close-output-pipe p)
(apply values results) ) ) ) ) ) )
(define-foreign-variable _pipefd0 int "C_pipefds[ 0 ]")
(define-foreign-variable _pipefd1 int "C_pipefds[ 1 ]")
(define create-pipe
(lambda ()
(when (fx< (##core#inline "C_pipe" #f) 0)
(posix-error #:file-error 'create-pipe "cannot create pipe") )
(values _pipefd0 _pipefd1) ) )
;;; Signal processing:
(define-foreign-variable _nsig int "NSIG")
(define-foreign-variable _sigterm int "SIGTERM")
(define-foreign-variable _sigkill int "SIGKILL")
(define-foreign-variable _sigint int "SIGINT")
(define-foreign-variable _sighup int "SIGHUP")
(define-foreign-variable _sigfpe int "SIGFPE")
(define-foreign-variable _sigill int "SIGILL")
(define-foreign-variable _sigbus int "SIGBUS")
(define-foreign-variable _sigsegv int "SIGSEGV")
(define-foreign-variable _sigabrt int "SIGABRT")
(define-foreign-variable _sigtrap int "SIGTRAP")
(define-foreign-variable _sigquit int "SIGQUIT")
(define-foreign-variable _sigalrm int "SIGALRM")
(define-foreign-variable _sigpipe int "SIGPIPE")
(define-foreign-variable _sigusr1 int "SIGUSR1")
(define-foreign-variable _sigusr2 int "SIGUSR2")
(define-foreign-variable _sigvtalrm int "SIGVTALRM")
(define-foreign-variable _sigprof int "SIGPROF")
(define-foreign-variable _sigio int "SIGIO")
(define-foreign-variable _sigurg int "SIGURG")
(define-foreign-variable _sigchld int "SIGCHLD")
(define-foreign-variable _sigcont int "SIGCONT")
(define-foreign-variable _sigstop int "SIGSTOP")
(define-foreign-variable _sigtstp int "SIGTSTP")
(define-foreign-variable _sigxcpu int "SIGXCPU")
(define-foreign-variable _sigxfsz int "SIGXFSZ")
(define-foreign-variable _sigwinch int "SIGWINCH")
(define signal/term _sigterm)
(define signal/kill _sigkill)
(define signal/int _sigint)
(define signal/hup _sighup)
(define signal/fpe _sigfpe)
(define signal/ill _sigill)
(define signal/segv _sigsegv)
(define signal/abrt _sigabrt)
(define signal/trap _sigtrap)
(define signal/quit _sigquit)
(define signal/alrm _sigalrm)
(define signal/vtalrm _sigvtalrm)
(define signal/prof _sigprof)
(define signal/io _sigio)
(define signal/urg _sigurg)
(define signal/chld _sigchld)
(define signal/cont _sigcont)
(define signal/stop _sigstop)
(define signal/tstp _sigtstp)
(define signal/pipe _sigpipe)
(define signal/xcpu _sigxcpu)
(define signal/xfsz _sigxfsz)
(define signal/usr1 _sigusr1)
(define signal/usr2 _sigusr2)
(define signal/winch _sigwinch)
(define signal/bus _sigbus)
(define signal/break 0)
(define signals-list
(list
signal/term signal/kill signal/int signal/hup signal/fpe signal/ill
signal/segv signal/abrt signal/trap signal/quit signal/alrm signal/vtalrm
signal/prof signal/io signal/urg signal/chld signal/cont signal/stop
signal/tstp signal/pipe signal/xcpu signal/xfsz signal/usr1 signal/usr2
signal/winch signal/bus))
(define set-signal-mask!
(lambda (sigs)
(##sys#check-list sigs 'set-signal-mask!)
(##core#inline "C_sigemptyset" 0)
(for-each
(lambda (s)
(##sys#check-exact s 'set-signal-mask!)
(##core#inline "C_sigaddset" s) )
sigs)
(when (fx< (##core#inline "C_sigprocmask_set" 0) 0)
(posix-error #:process-error 'set-signal-mask! "cannot set signal mask") )))
(define signal-mask
(getter-with-setter
(lambda ()
(##core#inline "C_sigprocmask_get" 0)
(let loop ([sigs signals-list] [mask '()])
(if (null? sigs)
mask
(let ([sig (car sigs)])
(loop (cdr sigs)
(if (##core#inline "C_sigismember" sig) (cons sig mask) mask)) ) ) ) )
set-signal-mask!))
(define (signal-masked? sig)
(##sys#check-exact sig 'signal-masked?)
(##core#inline "C_sigprocmask_get" 0)
(##core#inline "C_sigismember" sig) )
(define (signal-mask! sig)
(##sys#check-exact sig 'signal-mask!)
(##core#inline "C_sigemptyset" 0)
(##core#inline "C_sigaddset" sig)
(when (fx< (##core#inline "C_sigprocmask_block" 0) 0)
(posix-error #:process-error 'signal-mask! "cannot block signal") ))
(define (signal-unmask! sig)
(##sys#check-exact sig 'signal-unmask!)
(##core#inline "C_sigemptyset" 0)
(##core#inline "C_sigaddset" sig)
(when (fx< (##core#inline "C_sigprocmask_unblock" 0) 0)
(posix-error #:process-error 'signal-unmask! "cannot unblock signal") ) )
;;; Getting system-, group- and user-information:
(define-foreign-variable _uname int "C_uname")
(define-foreign-variable _uname-sysname nonnull-c-string "C_utsname.sysname")
(define-foreign-variable _uname-nodename nonnull-c-string "C_utsname.nodename")
(define-foreign-variable _uname-release nonnull-c-string "C_utsname.release")
(define-foreign-variable _uname-version nonnull-c-string "C_utsname.version")
(define-foreign-variable _uname-machine nonnull-c-string "C_utsname.machine")
(define system-information
(lambda ()
(when (fx< _uname 0)
(##sys#update-errno)
(##sys#error 'system-information "cannot retrieve system information") )
(list _uname-sysname
_uname-nodename
_uname-release
_uname-version
_uname-machine) ) )
(define current-user-id
(getter-with-setter
(foreign-lambda int "C_getuid")
(lambda (id)
(when (fx< (##core#inline "C_setuid" id) 0)
(##sys#update-errno)
(##sys#error 'set-user-id! "cannot set user ID" id) ) )
"(current-user-id)"))
(define current-effective-user-id
(getter-with-setter
(foreign-lambda int "C_geteuid")
(lambda (id)
(when (fx< (##core#inline "C_seteuid" id) 0)
(##sys#update-errno)
(##sys#error
'effective-user-id!-setter "cannot set effective user ID" id) ) )
"(current-effective-used-id)"))
(define current-group-id
(getter-with-setter
(foreign-lambda int "C_getgid")
(lambda (id)
(when (fx< (##core#inline "C_setgid" id) 0)
(##sys#update-errno)
(##sys#error 'set-user-id! "cannot set group ID" id) ) )
"(current-group-id)") )
(define current-effective-group-id
(getter-with-setter
(foreign-lambda int "C_getegid")
(lambda (id)
(when (fx< (##core#inline "C_setegid" id) 0)
(##sys#update-errno)
(##sys#error
'effective-group-id!-setter "cannot set effective group ID" id) ) )
"(current-effective-group-id)") )
(define-foreign-variable _user-name nonnull-c-string "C_user->pw_name")
(define-foreign-variable _user-passwd nonnull-c-string "C_user->pw_passwd")
(define-foreign-variable _user-uid int "C_user->pw_uid")
(define-foreign-variable _user-gid int "C_user->pw_gid")
(define-foreign-variable _user-gecos nonnull-c-string "C_PW_GECOS")
(define-foreign-variable _user-dir c-string "C_user->pw_dir")
(define-foreign-variable _user-shell c-string "C_user->pw_shell")
(define (user-information user #!optional as-vector)
(let ([r (if (fixnum? user)
(##core#inline "C_getpwuid" user)
(begin
(##sys#check-string user 'user-information)
(##core#inline "C_getpwnam" (##sys#make-c-string user 'user-information)) ) ) ] )
(and r
((if as-vector vector list)
_user-name
_user-passwd
_user-uid
_user-gid
_user-gecos
_user-dir
_user-shell) ) ) )
(define (current-user-name)
(car (user-information (current-user-id))) )
(define (current-effective-user-name)
(car (user-information (current-effective-user-id))) )
(define-foreign-variable _group-name nonnull-c-string "C_group->gr_name")
(define-foreign-variable _group-passwd nonnull-c-string "C_group->gr_passwd")
(define-foreign-variable _group-gid int "C_group->gr_gid")
(define group-member
(foreign-lambda* c-string ([int i])
"C_return(C_group->gr_mem[ i ]);") )
(define (group-information group #!optional as-vector)
(let ([r (if (fixnum? group)
(##core#inline "C_getgrgid" group)
(begin
(##sys#check-string group 'group-information)
(##core#inline "C_getgrnam" (##sys#make-c-string group 'group-information)) ) ) ] )
(and r
((if as-vector vector list)
_group-name
_group-passwd
_group-gid
(let loop ([i 0])
(let ([n (group-member i)])
(if n
(cons n (loop (fx+ i 1)))
'() ) ) ) ) ) ) )
(define _get-groups
(foreign-lambda* int ([int n])
"C_return(getgroups(n, C_groups));") )
(define _ensure-groups
(foreign-lambda* bool ([int n])
"if(C_groups != NULL) C_free(C_groups);"
"C_groups = (gid_t *)C_malloc(sizeof(gid_t) * n);"
"if(C_groups == NULL) C_return(0);"
"else C_return(1);") )
(define (get-groups)
(let ([n (foreign-value "getgroups(0, C_groups)" int)])
(when (fx< n 0)
(##sys#update-errno)
(##sys#error 'get-groups "cannot retrieve supplementary group ids") )
(unless (_ensure-groups n)
(##sys#error 'get-groups "out of memory") )
(when (fx< (_get-groups n) 0)
(##sys#update-errno)
(##sys#error 'get-groups "cannot retrieve supplementary group ids") )
(let loop ([i 0])
(if (fx>= i n)
'()
(cons (##core#inline "C_get_gid" i) (loop (fx+ i 1))) ) ) ) )
(define (set-groups! lst0)
(unless (_ensure-groups (length lst0))
(##sys#error 'set-groups! "out of memory") )
(do ([lst lst0 (##sys#slot lst 1)]
[i 0 (fx+ i 1)] )
((null? lst)
(when (fx< (##core#inline "C_set_groups" i) 0)
(##sys#update-errno)
(##sys#error 'set-groups! "cannot set supplementary group ids" lst0) ) )
(let ([n (##sys#slot lst 0)])
(##sys#check-exact n 'set-groups!)
(##core#inline "C_set_gid" i n) ) ) )