70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
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/* Copyright (C) 1994-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <fd_to_filename.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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#include <kernel-features.h>
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/* Execute the file FD refers to, overlaying the running program image.
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ARGV and ENVP are passed to the new program, as for `execve'. */
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int
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fexecve (int fd, char *const argv[], char *const envp[])
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{
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if (fd < 0 || argv == NULL || envp == NULL)
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{
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__set_errno (EINVAL);
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return -1;
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}
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#ifdef __NR_execveat
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/* Avoid implicit array coercion in syscall macros. */
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INLINE_SYSCALL (execveat, 5, fd, "", &argv[0], &envp[0], AT_EMPTY_PATH);
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# ifndef __ASSUME_EXECVEAT
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if (errno != ENOSYS)
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return -1;
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# endif
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#endif
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#ifndef __ASSUME_EXECVEAT
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/* We use the /proc filesystem to get the information. If it is not
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mounted we fail. We do not need the return value. */
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struct fd_to_filename filename;
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__execve (__fd_to_filename (fd, &filename), argv, envp);
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int save = errno;
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/* We come here only if the 'execve' call fails. Determine whether
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/proc is mounted. If not we return ENOSYS. */
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struct __stat64_t64 st;
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if (__stat64_time64 ("/proc/self/fd", &st) != 0 && errno == ENOENT)
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save = ENOSYS;
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__set_errno (save);
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#endif
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return -1;
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}
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