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https://github.com/fluencelabs/musl
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14a0117117
the specification for execvp itself is unclear as to whether encountering a file that cannot be executed due to EACCES during the PATH search is a mandatory error condition; however, XBD 8.3's specification of the PATH environment variable clarifies that the search continues until a file with "appropriate execution permissions" is found. since it seems undesirable/erroneous to report ENOENT rather than EACCES when an early path element has a non-executable file and all later path elements lack any file by the requested name, the new code stores a flag indicating that EACCES was seen and sets errno back to EACCES in this case.
56 lines
1.1 KiB
C
56 lines
1.1 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <limits.h>
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#include "libc.h"
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extern char **__environ;
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int __execvpe(const char *file, char *const argv[], char *const envp[])
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{
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const char *p, *z, *path = getenv("PATH");
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size_t l, k;
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int seen_eacces = 0;
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errno = ENOENT;
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if (!*file) return -1;
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if (strchr(file, '/'))
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return execve(file, argv, envp);
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if (!path) path = "/usr/local/bin:/bin:/usr/bin";
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k = strnlen(file, NAME_MAX+1);
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if (k > NAME_MAX) {
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errno = ENAMETOOLONG;
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return -1;
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}
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l = strnlen(path, PATH_MAX-1)+1;
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for(p=path; ; p=z) {
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char b[l+k+1];
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z = strchr(p, ':');
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if (!z) z = p+strlen(p);
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if (z-p >= l) {
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if (!*z++) break;
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continue;
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}
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memcpy(b, p, z-p);
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b[z-p] = '/';
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memcpy(b+(z-p)+(z>p), file, k+1);
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execve(b, argv, envp);
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if (errno == EACCES) seen_eacces = 1;
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else if (errno != ENOENT) return -1;
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if (!*z++) break;
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}
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if (seen_eacces) errno = EACCES;
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return -1;
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}
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int execvp(const char *file, char *const argv[])
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{
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return __execvpe(file, argv, __environ);
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}
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weak_alias(__execvpe, execvpe);
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