fix: potentially printing wrong error message (#321)
it's possible for the close() calls to override the errno resulting in incorrect error message being printed. call error() immediately to avoid such possibilities. also refactor a couple conditions to avoid doing multiple checks. Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/321 Reviewed-by: Berke Kocaoğlu <berke.kocaoglu@metu.edu.tr>
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parent
9812d601c1
commit
658a935c04
2
main.c
2
main.c
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@ -567,8 +567,8 @@ static bool run_key_handler(const char *key, unsigned int mask)
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if (pfd.writefd < 0)
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return false;
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if ((pfs = fdopen(pfd.writefd, "w")) == NULL) {
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close(pfd.writefd);
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error(0, errno, "open pipe");
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close(pfd.writefd);
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return false;
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}
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37
util.c
37
util.c
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@ -233,8 +233,7 @@ spawn_t spawn(const char *cmd, char *const argv[], unsigned int flags)
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{
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pid_t pid;
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spawn_t status = { -1, -1, -1 };
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int pfd_read[2] = { -1, -1 };
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int pfd_write[2] = { -1, -1 };
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int pfd_read[2] = { -1, -1 }, pfd_write[2] = { -1, -1 };
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const bool r = flags & X_READ;
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const bool w = flags & X_WRITE;
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@ -247,16 +246,18 @@ spawn_t spawn(const char *cmd, char *const argv[], unsigned int flags)
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}
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if (w && pipe(pfd_write) < 0) {
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error(0, errno, "pipe: %s", cmd);
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if (r) {
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close(pfd_read[0]);
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close(pfd_read[1]);
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}
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error(0, errno, "pipe: %s", cmd);
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return status;
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}
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if ((pid = fork()) == 0) {
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bool err = (r && dup2(pfd_read[1], 1) < 0) || (w && dup2(pfd_write[0], 0) < 0);
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if ((pid = fork()) == 0) { /* in child */
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if ((r && dup2(pfd_read[1], 1) < 0) || (w && dup2(pfd_write[0], 0) < 0))
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error(EXIT_FAILURE, errno, "dup2: %s", cmd);
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if (r) {
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close(pfd_read[0]);
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close(pfd_read[1]);
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@ -265,29 +266,23 @@ spawn_t spawn(const char *cmd, char *const argv[], unsigned int flags)
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close(pfd_write[0]);
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close(pfd_write[1]);
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}
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if (err)
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error(EXIT_FAILURE, errno, "dup2: %s", cmd);
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execv(cmd, argv);
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error(EXIT_FAILURE, errno, "exec: %s", cmd);
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} else if (pid < 0) { /* fork failed */
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error(0, errno, "fork: %s", cmd);
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if (r)
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close(pfd_read[0]);
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if (w)
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close(pfd_write[1]);
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} else { /* in parent */
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status.pid = pid;
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status.readfd = pfd_read[0];
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status.writefd = pfd_write[1];
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}
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if (r)
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close(pfd_read[1]);
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if (w)
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close(pfd_write[0]);
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if (pid < 0) {
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if (r)
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close(pfd_read[0]);
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if (w)
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close(pfd_write[1]);
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error(0, errno, "fork: %s", cmd);
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return status;
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}
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status.pid = pid;
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status.readfd = pfd_read[0];
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status.writefd = pfd_write[1];
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return status;
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}
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