int
cosystem(const char* cmd)
{
Coshell_t* co;
Cojob_t* cj;
int status;
if (!cmd)
return !eaccess(pathshell(), X_OK);
if (!(co = coopen(NiL, CO_ANY, NiL)))
return -1;
if (cj = coexec(co, cmd, CO_SILENT, NiL, NiL, NiL))
cj = cowait(co, cj, -1);
if (!cj)
return -1;
/*
* synthesize wait() status from shell status
* lack of synthesis is the standard's proprietary sellout
*/
status = cj->status;
if (EXITED_TERM(status))
status &= ((1<<(EXIT_BITS-1))-1);
else
status = (status & ((1<<EXIT_BITS)-1)) << EXIT_BITS;
return status;
}
extern int
system(const char* cmd)
{
char* sh[4];
if (!cmd)
return !eaccess(pathshell(), X_OK);
sh[0] = "sh";
sh[1] = "-c";
sh[2] = (char*)cmd;
sh[3] = 0;
return procrun(NiL, sh, 0);
}
static pid_t
runve(int mode, const char* path, char* const* argv, char* const* envv)
{
register char* s;
register char** p;
register char** v;
void* m1;
void* m2;
pid_t pid;
int oerrno;
int ux;
int n;
#if defined(_P_DETACH) && defined(_P_NOWAIT)
int pgrp;
#endif
#if CONVERT
char* d;
char* t;
int m;
#endif
struct stat st;
char buf[PATH_MAX];
char tmp[PATH_MAX];
#if DEBUG
static int trace;
#endif
#if defined(_P_DETACH) && defined(_P_NOWAIT)
if (mode == _P_DETACH)
{
/*
* 2004-02-29 cygwin _P_DETACH is useless:
* spawn*() returns 0 instead of the spawned pid
* spawned { pgid sid } are the same as the parent
*/
mode = _P_NOWAIT;
pgrp = 1;
}
else
pgrp = 0;
#endif
if (!envv)
envv = (char* const*)environ;
m1 = m2 = 0;
oerrno = errno;
#if DEBUG
if (!trace)
trace = (s = getenv("_AST_exec_trace")) ? *s : 'n';
#endif
if (execrate(path, buf, sizeof(buf), 0))
{
if (!sysstat(buf, &st))
path = (const char*)buf;
else
errno = oerrno;
}
if (path != (const char*)buf && sysstat(path, &st))
return -1;
if (!S_ISREG(st.st_mode) || !(st.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))
{
errno = EACCES;
return -1;
}
if (magic(path, &ux))
{
#if _CYGWIN_fork_works
errno = ENOEXEC;
return -1;
#else
ux = 1;
p = (char**)argv;
while (*p++);
if (!(v = (char**)malloc((p - (char**)argv + 2) * sizeof(char*))))
{
errno = EAGAIN;
return -1;
}
m1 = v;
p = v;
*p++ = (char*)path;
*p++ = (char*)path;
path = (const char*)pathshell();
if (*argv)
argv++;
while (*p++ = (char*)*argv++);
argv = (char* const*)v;
#endif
}
/*
* the win32 dll search order is
* (1) the directory of path
* (2) .
* (3) /c/(WINNT|WINDOWS)/system32 /c/(WINNT|WINDOWS)
* (4) the directories on $PATH
* there are no cygwin dlls in (3), so if (1) and (2) fail
* to produce the required dlls its up to (4)
*
* the standard allows PATH to be anything once the path
* to an executable is determined; this code ensures that PATH
* contains /bin so that at least the cygwin dll, required
* by all cygwin executables, will be found
*/
if (p = (char**)envv)
{
n = 1;
while (s = *p++)
if (strneq(s, "PATH=", 5))
{
s += 5;
do
{
s = pathcat(s, ':', NiL, "", tmp, sizeof(tmp));
if (streq(tmp, "/usr/bin/") || streq(tmp, "/bin/"))
{
n = 0;
break;
}
} while (s);
if (n)
{
n = 0;
snprintf(tmp, sizeof(tmp), "%s:/bin", *(p - 1));
*(p - 1) = tmp;
}
break;
}
if (n)
{
n = p - (char**)envv + 1;
p = (char**)envv;
if (v = (char**)malloc(n * sizeof(char*)))
{
m2 = v;
envv = (char* const*)v;
*v++ = strcpy(tmp, "PATH=/bin");
while (*v++ = *p++);
}
}
#if CONVERT
if (!ux && (d = getenv(convertvars[0])))
for (p = (char**)envv; s = *p; p++)
if ((n = convert(d, s)) && (m = cygwin_posix_to_win32_path_list_buf_size(s + n)) > 0)
{
if (!(t = malloc(n + m + 1)))
break;
*p = t;
memcpy(t, s, n);
cygwin_posix_to_win32_path_list(s + n, t + n);
}
#endif
}
#if DEBUG
if (trace == 'a' || trace == 'e')
{
sfprintf(sfstderr, "%s %s [", mode == _P_OVERLAY ? "_execve" : "_spawnve", path);
for (n = 0; argv[n]; n++)
sfprintf(sfstderr, " '%s'", argv[n]);
if (trace == 'e')
{
sfprintf(sfstderr, " ] [");
for (n = 0; envv[n]; n++)
sfprintf(sfstderr, " '%s'", envv[n]);
}
sfprintf(sfstderr, " ]\n");
sfsync(sfstderr);
}
#endif
#if _lib_spawn_mode
if (mode != _P_OVERLAY)
{
pid = sysspawnve(mode, path, argv, envv);
#if defined(_P_DETACH) && defined(_P_NOWAIT)
if (pid > 0 && pgrp)
setpgid(pid, 0);
#endif
}
else
#endif
{
#if defined(_P_DETACH) && defined(_P_NOWAIT)
if (pgrp)
setpgid(0, 0);
#endif
pid = sysexecve(path, argv, envv);
}
if (m1)
free(m1);
if (m2)
free(m2);
return pid;
}