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#ifndef _NO_EXECVE
/* execl.c */
/* This and the other exec*.c files in this directory require
the target to provide the _execve syscall. */
#include <_ansi.h>
#include <unistd.h>
#ifdef _EXECL_USE_MALLOC
#include <errno.h>
#include <stdlib.h>
#else
#include <alloca.h>
#endif
/* Only deal with a pointer to environ, to work around subtle bugs with shared
libraries and/or small data systems where the user declares his own
'environ'. */
static char ***p_environ = &environ;
#include <stdarg.h>
int
execl (const char *path,
const char *arg0, ...)
{
int i;
va_list args;
const char **argv;
i = 1;
va_start (args, arg0);
do
i++;
while (va_arg (args, const char *) != NULL);
va_end (args);
/* POSIX.1-2008 requires execl() to be callable from signal handlers while
malloc() isn't, so we default to using alloca(). However, unbounded stack
allocations is at a high risk of stack overflow and undefined behavior in
environments without virtual memory and small stacks, so we let targets
override the default and use malloc() */
#ifndef _EXECL_USE_MALLOC
argv = alloca (i * sizeof(const char *));
#else
argv = malloc (i * sizeof(const char *));
if (argv == NULL)
{
errno = ENOMEM;
return -1;
}
#endif
va_start (args, arg0);
argv[0] = arg0;
i = 1;
do
argv[i] = va_arg (args, const char *);
while (argv[i++] != NULL);
va_end (args);
i = _execve (path, (char * const *) argv, *p_environ);
#ifdef _EXECL_USE_MALLOC
free (argv);
#endif
return i;
}
#endif /* !_NO_EXECVE */
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