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implement fexecve in terms of execveat when it exists

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This lets fexecve work even when /proc isn't mounted.
This commit is contained in:
Joseph C. Sible 2018-09-02 13:42:26 -04:00 committed by Rich Felker
parent 0fa1e638e8
commit e36f80cba6
1 changed files with 5 additions and 0 deletions
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5
src/process/fexecve.c
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@ -1,10 +1,15 @@
#define _GNU_SOURCE
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include "syscall.h"
void __procfdname(char *, unsigned);
int fexecve(int fd, char *const argv[], char *const envp[])
{
int r = __syscall(SYS_execveat, fd, "", argv, envp, AT_EMPTY_PATH);
if (r != -ENOSYS) return __syscall_ret(r);
char buf[15 + 3*sizeof(int)];
__procfdname(buf, fd);
execve(buf, argv, envp);