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convert execvp error handling to switch statement

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this is more extensible if we need to consider additional errors, and
more efficient as long as the compiler does not know it can cache the
result of __errno_location (a surprisingly complex issue detailed in
commit a603a75a72bb469c6be4963ed1b55fabe675fe15).
This commit is contained in:
Rich Felker 2018-02-21 11:59:34 -05:00
parent 8e0b38060d
commit 6d6102427d
1 changed files with 9 additions and 2 deletions
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11
src/process/execvp.c
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@ -39,8 +39,15 @@ int __execvpe(const char *file, char *const argv[], char *const envp[])
b[z-p] = '/';
memcpy(b+(z-p)+(z>p), file, k+1);
execve(b, argv, envp);
if (errno == EACCES) seen_eacces = 1;
else if (errno != ENOENT && errno != ENOTDIR) return -1;
switch (errno) {
case EACCES:
seen_eacces = 1;
case ENOENT:
case ENOTDIR:
break;
default:
return -1;
}
if (!*z++) break;
}
if (seen_eacces) errno = EACCES;